Okay, thanks, was just wondering litmus/liquid, litmus/liquid which was better.
This product is by Grotek Mfg. and the 6.8 is more of a green color, the 7.0 is a blue green and the 7.2 is a real blue color; mine totally match the 7.0. But you are right, they do not have 6.9 or 7.1, so it is around 7.0.
The chart from Paul's site though does also jump .2 for each reading and I never did see a liquid tester in the pet store that had .1 increment readings.
Thank you again for your helpful postings.